Multi-port beamsplitters based on multi-core optical fibers for high-dimensional quantum information

J Cariñe, P Skrzypczyk, G Lima*, et al.

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

Multi-port beamsplitters are cornerstone devices for high-dimensional quantum information tasks, which can outperform the two-dimensional ones. Nonetheless, the fabrication of such devices has been proven to be challenging with progress only recently achieved with the advent of integrated photonics. Here, we report on the production of high-quality N times N (with N=4,7) multi-port beamsplitters based on a new scheme for manipulating multi-core optical fibers. By exploring their compatibility with optical fiber components, we create 4-dimensional quantum systems and implement the measurement-device-independent random number generation task with a programmable 4-arm interferometer operating at a 2 MHz repetition rate. Thanks to the high visibilities observed, we surpass the 1-bit limit of binary protocols and attain 1.23 bits of certified private randomness per experimental round. Our result demonstrates that fast switching, low-loss and high optical quality for high-dimensional quantum information can be simultaneously achieved with multi-core fiber technology.
Original languageEnglish
Pages (from-to)542-550
Number of pages9
JournalOptica
Volume7
Issue number5
DOIs
Publication statusPublished - 15 May 2020

Structured keywords

  • Bristol Quantum Information Institute
  • QITG

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